Jake Wants to Start a Family with Reese!

Jake Gyllenhaal will no doubt be celebrating his first "unofficial" Father's Day when he rings in the holiday this year with girlfriend Reese Witherspoon and her kids Ava,8, and 4-year-old Deacon.

In fact, sources say the couple has grown so close that Jake practically considers Reese's kids his own — and now friends of the actor say he's pushing to tie the knot with his Legally Blonde love so that the two can start a family of their own!

"He knows he might be jumping the gun thinking of kids, but he knows that Reese is the one," a pal of Jake tells OK!. "He laughs and says he needs to propose and do this the right way. It really is first comes love, then comes marriage — cheesy as that sounds, it's the way he thinks!"

As much as she loves Jake and enjoys him being with her kids, Reese,32, knows how hard it is to be a parent. Although the Brokeback Mountain star is an uncle to his sister Maggie Gyllenhaal and her fiancé Peter Sarsgaard's 20-month-old daughter, Ramona, Reese wants to make sure he's ready.

Meanwhile, the couple has been increasingly more comfortable taking their relationship public — cuddling outside L.A.'s Katsuya on May 24 and grabbing coffee a day later at Caffe Luxxe in Santa Monica.

"Reese has admitted that Jake has grown from when they first met into this very dependable dad type," a pal says, adding, "He's ready to have his whole life change."

For more on Jake and Reese's relationship, pick up the new OK! — on sale everywhere!